66315047 has 2 divisors, whose sum is σ = 66315048. Its totient is φ = 66315046.

The previous prime is 66315043. The next prime is 66315061. The reversal of 66315047 is 74051366.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66315047 - 2² = 66315043 is a prime.

It is a super-2 number, since 2×66315047² = 8795370917224418, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66315043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33157523 + 33157524.

It is an arithmetic number, because the mean of its divisors is an integer number (33157524).

Almost surely, 2^66315047 is an apocalyptic number.

66315047 is a deficient number, since it is larger than the sum of its proper divisors (1).

66315047 is an equidigital number, since it uses as much as digits as its factorization.

66315047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 66315047 is about 8143.4051231656. The cubic root of 66315047 is about 404.7660021043.

The spelling of 66315047 in words is "sixty-six million, three hundred fifteen thousand, forty-seven".